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SOMERVILLE — Abigail Hammond is at a loss for words. Her makeshift family is falling apart. An upended sofa stands in the living room in her first-floor Inman Square apartment — a reminder that one of her roommates is moving out.

“I feel like this general dissolution,” said the 28-year-old yoga instructor, who is trying to gain a foothold in her life, in her career. “I realize that this kind of community . . . it’s hard to find. It’s not just a home.”

The three-decker house on Dimick Street that Hammond has lived in for three years is under agreement to be sold, the closing scheduled for mid-August. Already five of the 11 tenants have scrambled to find new housing in order to beat the 20 percent rent increase coming in September and the student rush.

Hammond is stuck, not sure whether to stay or go.

Across town in East Somerville, Miriam Coutinho, a 28-year-old native of Brazil, can’t fathom leaving the four-bedroom she shares with her husband and two children and uses as a base for her day care — even with the rent rising twice in one year. “Oh, my God,” she said, “if I had to move out — that question is making me nervous.”

Hammond and Coutinho share a love for the neighborhoods in which they live and work, but now that affection is mixed with a deep anxiety.

As Somerville’s gentrification efforts come to fruition, and with the development of Union Square and the MBTA Green Line extension more certain, the city, once dubbed “Slummerville,” is shedding its undermarket identity. Caught up in the transition are the very folks who help make the community vibrant and diverse — artists, entrepreneurs, college grads, immigrant families, blue-collar workers, young professionals — forcing some to abandon the urban nexus for more affordable housing farther and farther away from the communities they helped build.

Think of it as dominoes falling.

Clink. Clink.

“It’s like Cambridge all over again,” said Max Dublin of Hammond Real Estate, the listing agent for the house on Dimick Street (Abigail Hammond has no affiliation with the agency). “It’s only natural that Somerville was next.”

The “domino effect” in real estate is a chain reaction set off by rising rents and home prices in one community, forcing those who can’t afford to stay to topple, like dominoes, into the next affordable neighborhood. It is common in high-cost metropolitan areas such as Boston, according to Nicolas P. Retsinas, senior lecturer in real estate at the Harvard Business School.

Up until the past few years, Somerville has been that affordable neighborhood, an alternative to high-rent Boston and Cambridge, allowing anyone who longed for the vibrancy of a city and proximity to the Hub a piece of property (bought or rented) in exchange for a little grit and a blighted block or two.

But that blight has morphed into prettier streets and higher property values. With the constant influx of students and empty-nesters now flocking to Boston, city living is in high demand.

Dublin sees local and foreign investors with deep pockets making offers 5 percent to 10 percent or more above asking price. Homes are being sold within days or weeks, not months. “The word I keep coming back to is ‘crazy,’ ” Dublin said. The Dimick Street house was listed at $1.1 million.

Mirroring that trend: Since 2011, the median, or midpoint, rent in Somerville has jumped by about 30 percent, from $1,683 to $2,183, according to Zillow.com.

Clink.

Erika Pereira, a realtor with Arlington-based Bowes Real Estate, acknowledged the domino effect, but said the path is different this time: “We are not in a typical market by any means.”

Medford and Arlington, usually the next stops for affordable housing stock after Somerville, are already seeing increases in home sales and rents. This is forcing folks to look to cities such as Salem and Quincy or even out of state.

“This is not that new of a phenomenon,” said Marc Draisen, executive director of the Metropolitan Area Planning Council, Greater Boston’s land use-planning agency. “It’s been a very expensive housing market for my entire career.”

For decades, low-income families have been displaced as communities have gentrified, turning to housing in the “Gateway Cities” like Lowell and Brockton, Draisen said, and now it’s affecting the middle class. “We need young families to take these jobs [once held by baby boomers]. They can’t stay here because they can’t find a place to live.”

One out of every two households in Eastern Massachusetts is cost burdened, he said. That’s when you spend more than 30 percent of your income on housing. One out of four is shelling out more than 50 percent.

Anastasia Cazabon, a filmmaker and video editor who works at the Brattle Theatre in Harvard Square, is one of the tenants who split from the Dimick Street house. She found a room in a Union Square apartment she’ll share with two others, the same setup as before, but for $100 more.

The 30-year-old Cambridge native, however, is fed up with rent increases and the poor conditions of the apartments she can afford. In an e-mail, Cazabon lists “bedbugs, mice, condemned porches, black mold in bathrooms, holes in walls, homeless people living in basements” among the conditions she has endured.

“I don’t know many people who are originally from here [like myself] that can afford to live here anymore,” Cazabon wrote. “I’m actually probably going to be moving in a year to another city, because the rent is so unaffordable and, unfortunately, Boston doesn’t have enough to offer for artists/creative types, so it really isn’t worth it for me to stay here.”

Within the past six months, her rent rose by $200, to $1,700. In six months, the rent is going to be $2,000. She knows that when the Green Line extension comes it will go even higher. Her husband, Samuel, also Brazilian, is looking for a second job on top of his full-time work at Market Basket on Somerville Avenue stocking shelves. “He didn’t find anything yet,” she said. “My husband doesn’t want to leave Somerville.”

Coutinho has applied for a three-bedroom apartment in Saint Polycarp Village
, a new affordable-housing complex with 84 units in Winter Hill.

Hammond doesn’t want to leave, either. She can bike to her nutrition-counseling practice near Davis Square. She walks to her yoga classes next to the Market Basket, where she has purchased store-brand items like oatmeal to save money and picked up the occasional 89-cent can of Goya black beans.

wendy maeda/ globe staff

Abigail Hammond’s Somerville apartment is being sold. The 28-year-old yoga instructor’s rent was $550 when she lived in the same neighborhood while in grad school five years ago. In September, she may be paying $900.

She lived in the same neighborhood while in grad school at Boston University, paying $550 for rent five years ago. When she moved away to take a job in upstate New York, she lasted two years. “I moved back here for this kind of lifestyle,” she said.

Over the past three years she and her housemates shared meals, celebrated birthdays, squeezed lawn chairs onto the patch of grass in the backyard to watch “Pulp Fiction” on a sheet, and held corn-free Fourth of July parties that would make mono-crop protesters proud. When Hammond was making a birthday cheesecake for roommate Yaroslav “Yaro” Tenzer, she borrowed an electric mixer in a pinch.

If she stays in the apartment, Hammond faces the 20 percent increase in rent in September, from $750 to $900 — not a lot of dough unless you consider she already spends close to half of her modest income on housing and needs to find another roommate to make it work. If she goes, she needs to invest the time — now — to look for something that won’t uproot her whole life.

It may be too late for that.

“I think I’m going to move,” said Hammond, “but I feel very stuck around that. There’s so much change right now. I like the Somerville three-deckers. I like this place.”

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